customer erin swenson ordebut they didn't fit.line customer's not happy, i'm not happy. sales go down, i'm not happy. merch comes back, i'm not happy. use ups. they make returns easy. unhappy customer becomes happy customer. then, repeat customer. easy returns, i'm happy. repeat customers, i'm happy. sales go up, i'm happy. i ordered another pair. i'm happy. (both) i'm happy. i'm happy. happy. happy. happy. happy. happy happy. i love logistics. >>> welcome back. well, it's every parents' worst nightmare. losing a child in a crowded place. how much better would you feel if you could keep track of your child's location from your smartphone? our next guest invented just that, the buddy tag app. after a scary incident with his daughter at an amusement park. willie and bethanie wu join us. thanks for getting up early. >> thank you for having us. >> so, willie, how did you decide to come up with this app? >> well, it happened last year. my wife and i took the kids to six flags in texas and it was at the end of the day. we were heading home and we lost bethanie. we lost track o